Signia, Siemens, Rexton, etc… Sounds confusing and it is because they are all the same owner Sivantos… https://www.sivantos.com/en/about-us/our-brands/
I think it’s that there are some small cosmetic differences, different terminology for same features and some small feature differences that really differentiate the hearing aids. To reduce cost, the circuit boards and IC’s are likely common between the lines for improved margins. When you look at the remote application for the three separate product lines, you see the programmatic layouts are nearly identical. Why does the Easytek, Smart Connect pendants look so identical? Why do so many of the program features match?
Like different style/packages available from a car manufacturers for a new make/model, so are the hearing aids from Sivantos… But it’s fun to argue that they are Rexton and not Signia or Siemens or vice versa, so I digress.
Take a look at the Signia accessory line here: Signia Hearing Aid Accessories - Signia Hearing Aids Compare the exact shape and function to the accessory line of the KS 7.0 at Costco, forget the name, look at the exact design shape, you can see the Costco guides for each accessory for comparison here: http://www.ks7userportal.com/userguides/.
Next take a look at the Rexton accessory line here: Accessories for Hearing Aids - Rexton Hearing Aids - We are talking about the same exact shape and function…
In any event, like many other Kirkland products made by great brands for the Costco Kirkland brand, you are getting top notch high quality hearing aids at a very reasonable price. I know I enjoy mine!